Cable Cross Section Calculator

Calculate the minimum required conductor cross-sectional area (mm²) based on current, cable length, and voltage drop limit according to IEC 60228 and national standards.

Conductor Material

Copper (Cu, ρ = 1.72×10⁻⁸ Ω·m) Aluminum (Al, ρ = 2.83×10⁻⁸ Ω·m)

System Phase

Single Phase / DC (230V / 120V / DC) 3-Phase (380V / 400V / 480V)

Load Current I (A)

One-way Cable Length L (m)

Max Voltage Drop (%) Recommended: Lighting ≤3%, Power ≤5%

System Voltage (V)

Results

Min Calculated Area	— mm²
Recommended IEC Size	— mm²
Actual Voltage Drop	— V (—%)
IEC Ampacity Rating	— A
Ampacity Check	—

Formulas

Single Phase / DC: A = 2 × ρ × L × I / (ΔU)

3-Phase: A = √3 × ρ × L × I / (ΔU)

ΔU = System Voltage × Drop %

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